<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
</body>
<script>
  var arr = [{ label: '男', value: 1 }, { label: '女', value: 0 }]

  function f(arr) {
    // 写代码，得到
    return arr.map(item => item.label)

  }
  var arr2 = f(arr2);
  console.log(arr2)
 // arr2 = ['男', '女']
</script>

</html>